https://squareoffnow.com/
Anybody familiar with this product? Is there a better choice for a self moving chess board with a strong engine? Maybe stockfish.

The board itself does not contain the engine. The board requires you to use an app that is downloaded and installed to your cell phone. Without the app, one cannot play it. You can download the app today ( both and Android and Iphone) and play the engine. The app itself is limited in features but is based on stockfish so it is hard to beat at full strength.